Method of forming brake-shoes.



w H. JONES. METHOD OF FORMING BRAKE SHOES APPLICATION FILED JAN.23, I9I5.

Patented Jan. 11, 1916.

A TTOR/VEYS Uli ED rnrnnir onion HARRY JONES, OF SUEFERN, NEW YORK, ASSIGNOR TO AMERICAN BRAKE SHOE & FOUNDRY COMPANY, OF MAI-KWAH, NEW JERSEY, A CORPORATION OF NEW JERSEY.

METHOD OF FORMING BRAKE-EHOES.

Application filed. January 23, 1915.

reticulated metal, which is subsequently insorted within a mold and the body of a brake shoe cast therearound, the'insert being so positioned, and of such dimensions, that it extends beyond the end, or ends, of the shoe body and is adapted to absorb a suitable oil, which, commingling with the lubricating coating, materially increases the etliciency thereof.

A further object is to provide a method whereby an oily and plastic insert may be directly embedded within a cast metal shoe, the end being attained by forming a porous, absorbentand lubricating coating upon the at and embedding the same directly hm the metal of the shoe body, and subsequently inserting one of the exposed ends oi. the said absorbent coating within a suit able oil, such as linseed or china wood, which, due to capillary action, flows throughout the entire coating, and commingling the ingredients thereof, renders the Shi'lnj plastic and cohesive, thus providing a noiseless and eliiciently operating brake shoe.

It further object is to provide a method for coating an insert for shoes, which, although. iormcd of a lubricating substance, will be of a porous texture or nature, car ie of lubricating the shoe. and further L ted to absorb an oil, rendering the incohesive and plastic, insuring the suci ul operation thereof, all of which propti not in any way injured by coir tact with the molten metal of the shoe as it cast thcrearound.

Uther objects and advantages of the method will appeai the description proceeds, wherein it i o be understood tha procedure can be damages in the made within the zm ill'd oi what is claimed Specification of Letters Patent.

Patented Jan. 111, 1916.,

Serial No. 3,875.

Without departing from the spirit of the invention. I

As illustrating the manner in which the process is carried out, Figure l is a view in plan of the insert, in the form of a wire netting previous to its repeated immersion Within a mixture of graphite and sodium silicate; Fig. 2 is a similar view after the wire has been immersed within the mixture and after it has been subjected to a high temperature, whereby it is rigidly baked to the wire in the form of a porous, absorbent coating; Fig. 3 illustrates the brake shoe with the insert therein, extending therer beyond, and immersed within a suitable vessel containing oil, whereby the oil is absorbed and passes throughout the porous coating so as to render the same cohesive and plastic; Fig. 4 is a view inside elevation, with portions thereof removed, of the completed brake shoe; Fig. 5 is a crosssectional view taken on the line 55 of Fig. 4. I

Referring specifically to the several figures, wherein similar reference numerals designate corresponding parts throughout, an insert 10, preferably formed of .wire, expanded metal,- open-work or reticulated metal, is cut to size so as tofit within a brake shoe mold, and of sufficient length to project beyond the end or ends of the shoe which is to be cast therearound. The insert is repeatedly dipped into a. mixture of substantially equal parts, by volume, of sodium silicate and graphite, the same be ing allowed to dry after each dipping so that a coating 11 may be built up of any desired thickness. The wire and coating is then subjected to a heat approximating 1200 F. whereby the water of crystallization of the sodium silicate will be driven OE,

and the entire mass baked together so as form aporous covering, which possesses sufficient rigidity and strength to withstand the action of the molten metal of the'brake shoe as the same is cast therearound; the coating, having been previously sub ected the Wearing face of the to prevent the graphite Iroui fishing away when the shoe is in service, the exposed end of the insert is immersed in s vessel of oil, as illustrated in Fig, 3, whereby oil will be absorbed by the porous coating or tubes and flows therethrough to mix or commingle With the vsrious ingredients. The oil ren- (lers the insert cohesive and plastic, preventing the fishing away or the graphite sud successfully eliminating all squeoking or noises incident to the application of the brake shoe to the Wheel.

The oil, Which may be lluscec, chine Wood, or other suitable cue, mixture ot oils, fiovs through the tubes of graphite clue to the porosity thereof and cormningles with and becomes 21 port of the lubrica ti u g tubes or costings oi the metal insert, which latter acts as supporting web or structure for the support of the tubes during the process oi formation of the shoe and lubricstiug insert. The protruding end of the insert is then cut away, and the completed shoe has embedded therein. a cohesive and plastic insort possessing lubricating qualities Y -'ch will prevent the chattering and. noise oi the shoe Without materially interfering with the proper properties thereof.

As e matter of fact, not only (less the lubricating" CORHpOLUlCl' IHMQ interfere with. the

broking properties or qualities of the shoe, but actually enhances th some. it will be understood in the mauutecttufe of brake shoes, harder the iron emcloyerl, the more the shoe is in service. "1ll1ese lasting qualities are imported to the shoe by constructing oi What is generally :iuctl White or hard. iron,thst I .uietol wherein there is little or no gre'bhitic or free carbon, the carbon being all, or for he most part, combined with the metal. ll the shoe constructed as above described, the graphite is add eel to the shoe while in service, that is, added to the Wearing suritsce thereot,

sud leucls to the shoe the lubricsnt which the shoe would naturally have "tslieu made of the softer metal or iron, sod is which instance the shoeis possessed of greater frictional qualities, clue to the shoe but iii orcler grsphitic carbon, the r suit being that While by my invention it is possible to use a White or hard iron to secure the lasting qualities of the shoe, yet the letter has imparted thereto the frictional qualities of a gray iron, due to the graphite scltlecl thereto in its free state.

What l claim is:

1. The inethorl of forming; brake shoes consisting in forming a coating, including graphite, upon an insert or metal, casting the body of a brake shoe therearouricl, and supplying a, liquid oil to the said coating.

2. The method of forming broke shoes consisting V casting a shoe bocly around an insert iucluuing a porous mixture of greplr its, positioning the said .iuscrt so as to trude beyond the borly of the shoe and iinmersirig the protruding end of said insert into a bother oil.

3, The method of forming broke shoes consisting in forming a plurality of interlaced or counectecl tubes of a porous mixture including graphite, casting the metal hotly of a shoe therecrouucl, and supplying an oil to the ssicl porous tubes for the obsorptioo thereof and rendering the said tubes cspeble 0t lubricating the shoe.

1. The method of forming brake shoes consisting in forming a plurality of interlaced or connected tubes of graphite and sodium silicate, casting a shoe body there erounrL-surl supplying on oil to solid porous tubes for the absorption of the former,

thereoy rendering seicl tubes capable of lubricating the shoe 5, The method of forming brake shoes consisting in costing reticulated metal with e porous mixture including; g ,phite, custiug a shoe bccly theresrou ul, and supplying oil to s "l porous costing.

Signed at New York, borough of, Meir hsttsn, in the county of New York aucl of New York, this li'itlgudey of Januery, D, 1915.

J QNES. Witnesses lw lrurr B. JUsTIcu,

Arms V. WALsrr.

pro.- 

